<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<style>
    div {
        width: 300px;
        height: 300px;
        background-color: pink;
    }
</style>
<body>
    <div>
        1
    </div>
    <script>
        // var div = document.querySelector('div');
        // div.addEventListener('click', fn)

        // function fn() {
        //     alert('123');
        //     div.removeEventListener('click', fn);
        // }
        var div = document.querySelector('div');
        div.addEventListener('click', function(e) {
            console.log(e.target);
            // console.log();
        })
    </script>
</body>
</html>